ppc/p4080: Add p4080 platform immap definitions

The p4080 SoC has a significant amount of commonality with the 85xx/PQ3
platform.  We reuse the 85xx immap and just add new definitions for
local access and global utils.  The global utils is now broken into
global utils, clocking and run control/power management.

The offsets from CCSR for a number of blocks have also changed.  We
introduce the CONFIG_FSL_CORENET define to distinquish the PQ3 style of
platform from the new p4080 platform.  We don't use QoirQ as there are
products (like p2020) that are PQ3 based platforms but have the QoirQ
name.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>